I was only partially correct. Looked again at asfinag and the grace period does not apply to 1 and 10-day vignettes. From their website:
"18-days-period
Consumer protection is very important to us – especially as far as our digital products are concerned.
Customers can withdraw from the online purchase of a digital vignette within 14 days. Taking into account a further three-day period for mail, your digital 2-months and annual vignette is only valid from the 18th day after purchase.
This deadline does not apply if you purchase a 1-day or 10-day vignette!"
> "18-days-period Consumer protection is very important to us"
Which is of course how you immediately know that it is not just unimportant to them but they will try to do anything to not have to abide by the rules and maliciously comply with anything they can't disregard completely.
Really the 14 days should start when you actually receive the item in a usable state and if the law actually allows these kind of workarounds around that then it should be changed.
"18-days-period Consumer protection is very important to us – especially as far as our digital products are concerned. Customers can withdraw from the online purchase of a digital vignette within 14 days. Taking into account a further three-day period for mail, your digital 2-months and annual vignette is only valid from the 18th day after purchase.
This deadline does not apply if you purchase a 1-day or 10-day vignette!"